For the first three, I took 90 second jogs but as you can see, the third 1000, my heart rate was spiking and I was tired so I took longer recoveries for the last three. I did most of the laps a few seconds faster than I should have, given my 5K PB is 19:30 and it called for 3:54 1Ks.

I just looked back at a few other 1000 metre intervals I've done in the past